I have 3 kids in the same school, DD(4), DS2(5) and DS1(9). Their school have started separating them or at least trying to discourage them from playing or talking to each other during break times. They have never chosen to play together everyday, have their own friends who more than half of the time they would rather be with but a few times a week want to talk to or play with each other instead. They also have never argued or misbehaved together at school so that's not the problem.
DH asked DS2's teacher quickly tonight if there had been any issues between them that we didn't know about and she there wasn't and that usually siblings will purposely stay away from each other but if not they will try to keep them away so they don't cause problems together and can focus on socialising with their own class during school time.
Is this a common thing done in primary schools? Would you think its actually benefitial and support it or question it instead?